Bronchiolitis perhaps? It's usually due to a viral infection. Maybe bring that up to your doctor?
Thank you, I will ask the Dr. Would that last this long though? This has been going on for a year now.
A year? Then I don't know because there would have been serious complications by now. The only causes I am aware of are bonchiolitis, RSV (respiratory syncytial virus), common cold, asthma, and chest congestion. I would see another doctor and get a second opinion. I know it's a pain, but maybe seeing another specialist would be a good idea. I wish you the best and Happy Mother's Day :)
If you think it could be airborne allergies (plants and mold), try local raw honey. My four year old had terrible allergies: she coughed constantly, her eyes would swell suddenly until they almost closed, runny nose, etc. We were told to try local raw honey. We fed her a spoonful a day and after about a week or two, her allergies were gone, never to be seen again. It was amazing! And so much better than going to a doctor, getting the grid on her back, being prescribed steroids and who knows what else. No side effects, no fights over taking medicine. And, if it doesn't work, you still have delicious honey for your tea and cakes!
Search around online for a local honey producer, I've been able to find one wherever I've lived. Just get honey that is as LOCAL as possible and RAW, and give it a whirl. It can't hurt.